I hate saying this considering how much LibreOffice, etc have invested -- but OTOH I imagine they understand their competition better than the average programmer who uses Office suites to track their month-to-month finances and thinks they've got it figured out.
There is the fact that actually challenging Excel as a product and implementing any competitor would technically require a substantial amount of labor and effort, on a very large scale. But that's just one part; the fact is that you can't actually win a battle unless you're willing to analyze where you've already lost. I think most FOSS users don't actually realize how badly they are losing to products like Office or even (the inferior, IMO) G-Suite. This isn't surprising in the grand scheme considering how much software freedom we've lost in the past few decades; it's just one more lost battle, but it still stings.
This isn't a situation that pleases me, but at the end of the day between an O365 family sub and the alternatives, it was very easy to make the choice given the returns I got.
We've had to ask you this kind of thing more than once. Would you mind reviewing https://news.ycombinator.com/newsguidelines.html and taking the spirit of this site more to heart? We'd be grateful.